Hi Vipin ,
Thanks alot for the reply.
I went through the FAQ and it also answered some of my questions.

But my problem is, since I am using TCP/Ethernet I guess that MPI uses
SSH/RSH to communicate between peers.
And for that, each peer should have the copy of the application right?

I use 1.2.7rc2 (from Debian/Lenny repo) , and I didn't see the option
"--preload-binary" , is it because the lower version?

Bets regards,
umanga.

vipin kumar wrote:

Hi,
I am not expert, I am user like you but I think I can help you,

Q. After installing OpenMPI on each machine ,do i need to run a
service/daemon on each machine?
Ans. No, not at all, Open MPI takes care of that for you.

Q. How does peers in MPI environment communicate ?
Ans. Using Communicator(name of the group of processes to whom it
belongs, technically handle) and rank of the process in that
Communicator.

Q. After implementing parallel program , do I have to install the
application on every machine ?
Ans. Not necessary. Use "--preload-binary" option while launching the
application through mpirun or mpiexec.